.header{
    width: 100%;
    height: 100px;
    background-color:pink;
}

.footer{
    width: 100%;
    height: 100px;
    background-color:green;
}

.content{
    width: 7.2rem;
    background-color: yellow;
    margin: 0 auto;
    overflow: auto;
}

.swapper{
    width: 100%;
    height: 150px;
    background-color: salmon;
    margin: 1px 0;
}